Arnold



(Nomad.)

A. HENGHOZ-ARNOLD 8a F. HENGHOZ-HUGUENIN.

STOP WATCH.

Patented Peb.20,1883.

- WITNESSES WAM/MQ INVBNTOR ATTORNEY UNITED STATES PATENT UEEICE..

AUGUSTE HENCHOZ-ARNOLD AND FRITZ HENCHOZ-HUGUENIN, F LOCLE, SWITZERLAND.

STOP-WATCH.

SPECIFICATION forming part of Letters Patent No. 272,545, dated February 20, 1883.

(No model.)

To all whom it may concern Be it known that we, AUGUSTE HENCHOZ- ARNOLD and FRITZ HENoHoz-HUGUENIN,

both of Locle, in the canton of Neuchatel and Republic of Switzerland, have invented certain new and useful Improvements in Stop-lVatches, of which the following is a specitcation.

This invention has reference to au improved stop-watch for timing purposes, which is set in motion by the third wheel of the watch-Inovement and intermediate gearing in such a manner that the parts forming the timing att-achment are independent from the movement, and are quickly thrown in or out ot' gear, so as to make the starting or stopping ot' the quartersecond hand almost instantaneous, without any eXtra forward or recoiliug motion.

The invention consists of the combination, with the shifting and stopping levers of a timing attachment, of a vertically-movable gearwheel actuated by the third wheelot' the movement, and provided with a conical disk at the under side, the arbor of the gear-wheel heilig lowered or raised by the starting-lever in connection with a spring ofthe bridge,so that the gear-wheel is thrown in or out ot' mesh with a slightly-beveled intermediate pinion that transmits the motion from the gear wheel to the heart-wheel and the quarter-second hand, which latter is started, stopped, and returned bythe usual mechanism employed in stop-watches.

In the accompanying drawings, Figure l represents a top view of ourimproved stop-watch, in which the operating parts are shown in a position of rest, with the quarter-second hand at zero. Fig. 2 is a detail vertical transverse section of the same on line x a', Fig. l; and Figs and 4 are detail top views, showing` the operating parts of the stop-Watch, respectively, in position for starting and stopping the quarter-second hand.

Similar letters ot' reference indicate corresponding parts.

The tmingattaehment ofour improved stopwatch is set in motion by the third wheel of the watch-movement by means of an intermediate arbor carrying a pinion which meshes with the third wheel and a gear-wheel for transmitting motion to the timing attachment. This has the advantage that all the parts of the timing attachment move more briskly than when actuated bythe second-wl1eel,and do not exert any retarding inliuence upon the motion ot1 the movement itself, so that the quartersecond hand may be permitted to move with the watchmovement for thirty-six hours (more or less) in a regular and reliable manner without in the least affecting the regular motion of the latter.

For the purposes of our invention a gearwhcel, A, having regular teeth, is placedon the intermediate arbor, a, which latter carries at its lower part a pinion, a', that meshes with the third wheel ot' the watchmovement, and is thereby continuou-ly kept in motion. The gear-wheel A is provided at its under side with a beveled conical disk, ai", that is readily engaged by the edge of a nose, b, of a fnlcrumed and spring pressed lever, B. the gear-wheel A is extended upward through a hole of a bridge, C, that is secured to the top plate ot' the movement and acted upon by the free end oi" a spring, a, attached to the bridge G. The bridge C, together with the top plate of the movement, supports also the arbors ot' an intermediate slightly-conical pinion, D, and ot' the usual heart-wheel, E, and quarter-second hand E. Theintermediateslightly-conicalpinion, D,meshes with the gear-wheel Aat one side and with the hcait-whecl at the opposite side, said heartwheel having teeth with square edges, like the gear-wheel A. The heart-wheel E is operated by a fulcrumed a n d springpressed shifting-lever, F, which acts upon the heart cam ot' the gear wheel E in the usual well -known manner in chronographs ot' this class. By the action of the spring a3 on the arbor a the gear-wheel A is thrown into mesh with the intermediate pinion, D, as soon as the beveled nose b ot the lever B is withdrawn. When the nose ot" the same engages the conical disk a2 ofthe wheel A the saine is instantly raised out ot' contact with the intermediate pinion, D, and thus the quartersecond hand brought to a stop.

The mechanism by which the shifting and stopping levers F and B are actuated is the same which is usually employed in stop-watches, and consists of an actuating-lever, G, hav ing a iinger-stud, g, projecting through the case ot' the watch, and ot` a double ratchetwheel, G', having a check-pawl, g. The ratchet-wheel G carries on its upper surface trianrlhe arbor a ofy IOO guiar studs g2, which, together with intermediate recesses between the studs, actuate the stopping and shifting,` levers B and F. The shifting-lever F is for this purpose provided with a projecting heehf, and the stopping-lever with a heel, b. rlhe dii'erentpositions 0f the shifting and stopping levers when the quarter-second hand is at the starting-pointer in motion or in a position of rest are respectively shown in Figs. l, 4, and 3.

The operation of the timing attachment is as follows: For starting the quarter-second hand the lever G is depressed and the ratchet-wheel G moved forward for the distance of two teeth, which causes the heel b ofthe lever B to drop in between two studs g2, while the heel j ot' the shiftingiever F is made to ride one ofthe studs g2, as shown in Fig. 3. The levers B and F are thereby moved away from the conical disli a2 of the gear-wheel A andthe heart-cani of gear-wheelE, respectively. The downward pressure of the spring` a on the arbor a causes the intermeshing ot' the gearwheel A with the slightly-beveled transmitting-pinion D, and thus the instant starting of the quarter-second hand. For stopping the hand the lever F is depressed a second time, whereby the ratchet-wheel is again moved forward for two teeth. The shifting` -lever F moves along the stud g2 and is kept away from the heart-cam, while the heel b of the starting-lever B is also engaged by one ot' the studs, so thatthe lever Bis thrown toward the disk a2 ofthe gear-wheel A, raising the latter and taking it out of mesh with the intermediate pinion, D, as shown in Fig'. 4L. As the square edges of the gear-wheels A and E mesh only at their lower corners with the slightlyconical intermediate pinion, I), theintermeshing or withdrawing ofthe geanwheel A takes place almost instantaneously, so that colisequently the starting; and stopping ofthe quarter-second hand takes place without any advancing or recoiling` motion. For returning the quarter-second hand to the starting-point, the lever F is depressed a third time, whereby the heelof the shiftinglever F is dropped into one ofthe recesses between the studs, so that its enlarged end engages the heart-cam and shifts the quarter-second hand back to the starting-point. The heel of the stopping-lever Bis engaged bythe nextadjoining stud g2, so as tov retain the gear-wheel A in raised position without allowing it to mesh with the intermediate pinion, D, as shown in Fin'. l. In this manner the different operations oi' starting, stopping, and returning the quarter-second hand are accomplished in a reliable manner by a simple, durable, and reliable mechanism, which is notliable to get out of order, and which supplies a chronograph ot' great accuracy of operation and regularity ot' motion.

Havingthus described ourinvention,we claim as newand desire to secure by Letters Patent- As an iml'irovenientin stop-watches, the cour bination ot' a vertically-movable gear-wheel receiving continuous motion from the third wheel 0i" the watch-train, said gear-wheel having a beveled disk at the under side, a stopping-lever engaging' said disk, a spring press ing on the arbor of said gear-wheel, abcveled transmitting-pinion, a quarter-second wheel, carrying a heart-cam, and a shifting-lever, substantially as described.

In testimony that we claim the foregoing as ourinvention we have signed our names in presence of two subscribing` witnesses.

AUGTE. HENCHOZARNOLU. FRITZ HENCHOZ-HUGUENIN. Witnesses z D. JAooT-GUlLLAn-Mon, M. ZINCHER. 

